What causes double letters with a single keystroke while in Calendar. I am using vs 10.10.2 with wireless keyboard. Have closed/opened Calendar, switching keyboard off/on, took out batteries on keyboard and have restarted computer.

What would cause double letters with a single key stroke while adding information to Calendar? Version: 10.10.2  wireless keyboard 27" iMac  3.4 GHz i5. Have restarted computer, have closed/opened Calendar, switched on/off keyboard and taken batteries out/in of keyboard. The problem only happens while typing in Calendar.
Not sure if I am accidentally hitting an unknown key to cause the problem or if it is a Calendar issue.........paul

Try changing System Preferences/Keyboard/Keyboard/Key Repeat to a slower setting. Test.

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